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最新推荐文章于 2020-09-26 10:23:15 发布

转载最新推荐文章于 2020-09-26 10:23:15 发布 · 356 阅读

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//在二维平面，给三种操作：
//add x y: 在(x,y)加入一个点，保证加之前这个坐标没有点存在
//remove x y: 删除(x,y)这个点，保证这个坐标有点存在
//find x y: 输出横坐标严格大于x，纵坐标严格大于y的最左边的点的坐标，如果有多个输出最下面的那个，如果无解输出-1
//1<=n<=2*10^5个操作，0<=x,y<=10^9

#include<set>
#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;

#define Lson(x) (x<<1)
#define Rson(x) (Lson(x)|1)
#define Mid(x,y) ((x+y)>>1)
#define Sum(x,y) (x+y)

const int MAXN = 200010;

struct Edge{
    int mark;
    int x;
    int y;
};
Edge e[MAXN];

struct Node{
    int left;
    int right;
    int max_y;
};
Node node[4*MAXN];

int n , m;
int num[MAXN];
set<int>s[MAXN];

void input()
{
    m = 1;
    char str[10];
    for(int i = 1 ; i <= n ; i++)
    {
        scanf("%s%d%d" , str , &e[i].x , &e[i].y);
        if(str[0] == 'a')
            e[i].mark = 1;
        else if(str[0] == 'r')
            e[i].mark = 2;
        else
            e[i].mark = 3;
        s[m].clear();
        num[m++] = e[i].x;
    }
}

inline void push_up(int pos){
    node[pos].max_y = max(node[Lson(pos)].max_y , node[Rson(pos)].max_y);
}

void buildTree(int left , int right , int pos)
{
    node[pos].left = left;
    node[pos].right = right;
    node[pos].max_y = -1;
    if(left == right)
        return;
    int mid = Mid(left , right);
    buildTree(left , mid , Lson(pos));
    buildTree(mid+1 , right , Rson(pos));
}

void update(int x , int pos)
{
    if(node[pos].left == node[pos].right){
        if(s[x].size())
            node[pos].max_y = *(--s[x].end());
        else
            node[pos].max_y = -1;
        return;
    }
    int mid = Mid(node[pos].left , node[pos].right);
    if(x <= mid)
        update(x , Lson(pos));
    else
        update(x , Rson(pos));
    push_up(pos);
}

int query(int x , int y , int pos)
{
    if(node[pos].right <= x)
        return -1;
    if(node[pos].max_y <= y)
        return -1;
    if(node[pos].left == node[pos].right)
        return node[pos].left;
    int t = query(x , y , Lson(pos));
    if(t == -1)
        t = query(x , y , Rson(pos));
    return t;
}

void solve(){
    sort(num+1 , num+1+m);
    m = unique(num+1 , num+1+m)-(num+1);
    buildTree(1 , m , 1);

    for(int i = 1 ; i <= n ; i++){
        int x = upper_bound(num+1 , num+1+m , e[i].x)-(num+1);
        int y = e[i].y;
        // add
        if(e[i].mark == 1){
            s[x].insert(y);
            update(x , 1);
        }
        // remove
        else if(e[i].mark == 2){
            s[x].erase(y);
            update(x , 1);
        }
        // find
        else{
            int ans = query(x , y , 1);
            if(ans == -1)
                puts("-1");
            else{
                printf("%d %d\n" , num[ans] , *s[ans].upper_bound(y));
            }
        }
    }
}

int main(){
    while(scanf("%d%*c" , &n) != EOF){
        input();
        solve();
    }
    return 0;
}